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You can get the modelines from your TV/Monitor's EDID information by running the command:

startx -- -logverbose 6

from the console. The EDID information should then be in /var/log/Xorg.0.log (or /var/log/XFree86.0.log). This works for the proprietary NVIDIA driver. I am not sure if other drivers display as much information.

Using any -logverbose level greater than or equal to 6 will give all the EDID info you need.

In particular, it checks all the EDID modelines and inbuilt X-server modelines (which includes various standard VESA modelines) to see if they are valid. If a modeline is found to be invalid, it states the reason why.